Reply by TeamTurpin

There is about zero chance of a dust system explosion in a small shop.

That being said, I went ahead and grounded mine. (You guys just have no idea how desperately bad my luck is.) I screwed sheet metal screws into my 4” pvc dust pipe every couple of feet. I then wrapped a heavy guage copper wire around my dust system’s frame and then around those embedded screws. Hopefully if static starts to build up in that pipe, it will jump onto that wire and find that fine Oklahoma clay soil.